The firm established its Hong Kong office in 1989 and Beijing office in 1993. The firm also established an "in association" relationship with Posman Kua Aisi Lawyers of Port Moresby, Papua New Guinea in 1995.

In response to client demand the firm then significantly increased its Hong Kong office capability. In 2002 some of the firm's most experienced partners were relocated to Hong Kong. As a result, Mallesons is renowned locally for its strength in the areas of debt capital markets and securitisation, as well as its pre-existing outstanding reputation in projects, construction and dispute resolution.

In 2004 the firm strengthened its Beijing resources by taking on some lawyers and support staff from the former local office of Denton Wilde Sapte. Later that year Mallesons merged with the Hong Kong/mainland China corporate boutique Kwok & Yih. We are now one of the law firms most frequently used by Chinese companies listing on the Hong Kong Stock Exchange.

Mallesons is today one of the top ten largest firms in Hong Kong and gaining significant market share in Asia.